avogadro's number

avogadro's number - Post-Lab Data Summary Note some...

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Post-Lab Data Summary Note : some questions will display a variable like "nCount" or "SyInput" instead of an actual number in the data summary. Q# Question Text 4) Part A. Scoring Scheme: 3-3-2-1 Referring to Figure 1, which you should have transcribed into your notebook, the instructions for Part A said to connect the (+) terminal of the multimeter (the red lead and red socket) to the electrode in the left- hand funnel and the (-) terminal of the multimeter (the black lead and black terminal) to the electrode in the right-hand funnel. Using this arrangement, which of the following choices describes the color changes observed during the electrolysis? Your Answer: b. The solution in the left-hand funnel went from green to red while the right-hand funnel went from green to blue-purple. You Scored 3 points out of 3 Possible 5) Part A. Scoring Scheme: 3-3-2-1 Again referring to Figure 1 as transcribed into your laboratory notebook and using the same conventions for left and right, which of the following choices correctly interprets the observed color changes that the solution in the left-hand funnel changed from green to red and the solution in the right-hand funnel changed from green to blue-purple? Your Answer: d. The solution in the left-hand funnel became acidic while the solution in the right-hand funnel became basic. You Scored 3 points out of 3 Possible 6) Part A. Scoring Scheme: 3-3-2-1 The two half reactions for electrolysis of water are: 1) 2 H 2 O(l) + 2e - --> H 2 (g) + OH - (aq), and 2) H 2 O(l) --> 2H + (aq) + (1/2) O 2 (g) + 2e - . Using the formation of an acidic solution at the left-hand (+) electrode and the formation of a basic solution at the right-hand (-) electrode as information, choose which of the following associates the correct half- reaction to the correct electrode. Your Answer: b. Half-reaction 2 occurs at the (+) electrode and half-reaction 1 occurs at the (-) electrode. You Scored 3 points out of 3 Possible 7) Part A. Scoring Scheme: 3-3-2-1 When you drained the solutions from the funnel apparatus and mixed them in the beaker, the blue-purple color of the right-hand funnel vanished and the solution regained its original red color. Which of the following reactions occurred upon mixing together the solutions that were surrounding the two electrodes and will therefore account for the color change observed? Your Answer: c. OH - (aq) + H 3 O + (aq) --> 2H 2 O(l) You Scored 3 points out of 3 Possible
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8) Part B. Data Entry - No Scoring How many trials of the determination of the evolved volume of H 2 gas from hydrolysis of water did you perform? Trials = Your Answer: 2 No Points Possible 10) Part B. Data Entry - No Scoring What was the value of the barometric pressure in mmHg in the laboratory on the day you performed the experiment? If necessary, convert your barometric pressure from inches of Hg to mm of Hg. Recall, 2.54 cm = 1 inch.
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This note was uploaded on 04/07/2008 for the course CHE che 2a taught by Professor Tingguo during the Winter '08 term at UC Davis.

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avogadro's number - Post-Lab Data Summary Note some...

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